I want to generate a mesh around the rotor+tower of a windturbine
so I need a rotating mesh inside a stationary one

can anyone help me with it? is it good to use ICEM or I should use Ansys Meshing?

Id appreciate any kind of information
thanks

strobel

September 12, 2012 07:11

i don't have good experience with it, but i guess you set that mesh is stationary or Rotating only in cfx-Pre.

PSYMN

September 12, 2012 09:09

Right, you could use either product...

If you are new and don't mind a tetra/prism mesh, ANSYS Meshing will be easier.

If you want a fancy Hexa mesh, then you will need to learn ICEM CFD.

In either case, you need to create an interface geometry in the shape of a cylinder aligned with the axis of rotation and extending some distance beyond the rotors.

You will end up meshing these as two pieces (the don't need to be node for node conformal, but the mesh at the interface should be roughly the same size and volume. The two meshes can be generated during the same session or separate sessions. (In ANSYS Meshing you would just have two parts and mesh them at once).

When you get to CFX or FLuent, they would be 2 separate zones. You would apply rotation to one of the zones in the solver.

James Hetfield

September 18, 2012 22:51

Quote:

Originally Posted by PSYMN
(Post 381403)

Right, you could use either product...

If you are new and don't mind a tetra/prism mesh, ANSYS Meshing will be easier.

If you want a fancy Hexa mesh, then you will need to learn ICEM CFD.

In either case, you need to create an interface geometry in the shape of a cylinder aligned with the axis of rotation and extending some distance beyond the rotors.

You will end up meshing these as two pieces (the don't need to be node for node conformal, but the mesh at the interface should be roughly the same size and volume. The two meshes can be generated during the same session or separate sessions. (In ANSYS Meshing you would just have two parts and mesh them at once).

When you get to CFX or FLuent, they would be 2 separate zones. You would apply rotation to one of the zones in the solver.

Hello
thanks for the replies
Simon, There is a problem when I want to mesh these two separate zones
I think it is related to the geometry and the way I define the rotating geometry inside the stationary one
the rotating zone belongs also to the stationary zone. I mean this region belongs to 2 different bodies :(

PSYMN

September 19, 2012 11:37

You mean it is overlapping/intersecting?

You need to subtract the inner volume from the outer volume using your cad tool. If you created it in DM, then you could use "Create => Boolean" or you could try "Tools => Enclosure".

Search the online help or tutorials for info on how to use these correctly.

Simon

James Hetfield

September 19, 2012 11:55

Quote:

Originally Posted by PSYMN
(Post 382583)

You mean it is overlapping/intersecting?

You need to subtract the inner volume from the outer volume using your cad tool. If you created it in DM, then you could use "Create => Boolean" or you could try "Tools => Enclosure".

Search the online help or tutorials for info on how to use these correctly.

Simon

I did try Boolean>Subtract, but afterward I would lose the rotating zone (inner region) and there would be no zones in FLUENT to rotate

PSYMN

September 19, 2012 12:11

Yea, look it up in the help... There is some control you need to set, something like "preserve tool body?" Yes.

James Hetfield

September 19, 2012 12:53

Quote:

Originally Posted by PSYMN
(Post 382589)

Yea, look it up in the help... There is some control you need to set, something like "preserve tool body?" Yes.